appropriately protected thymidine, d-cytidine or d-guanosine acceptors 5a–c, using trimethylsilyl trifluoromethanesulfonate (TMSOTf) as the activating system, furnished the respective (3′→5′) methylene acetal linked dimers d(T∧T), d(T∧G). Similarly, TMSOtf-promoted condensation of (5′-O,4-N)dibenzoyl-3′-O-acetyloxymethyl-2′-deoxycytidine with acceptors 5a–c yielded the corresponding d(C∧T), d(C∧C)
使用三甲基甲
硅烷基
三氟甲磺酸酯(5a-c)将5'-O-
乙酰丙酰基-3'-O-苯甲酰氧基甲基
胸苷或5'-O-苯甲酰基-3'-O-乙酰氧基甲基
胸苷与适当保护的
胸苷,d-
胞苷或d-
鸟苷受体5a–c缩合( TMSOTf)作为活化系统,提供了各自的(3'→5')亚甲基
缩醛连接的二聚体d(T∧T),d(T∧G)。同样,TMSOtf促进的(5'-O,4-N)二苯甲酰基-3'-O-乙酰氧基甲基-2'-脱氧
胞苷与受体5a–c的缩合产生相应的d(C∧T),d(C∧C )和d(C∧G)二聚体。